Improvement in sliding-door sheaves



UNITED STATES PATENT OFFICE.

ROBERT G. HATFIELD, OFNEW YORK, N. Y.

IMPROVEMENT- IN SLlDlNG-DOOR. SHEAVES.

Specification forming part of Letters Patent No. 38,387, dated May 5,1863.

To all whom it may concern,.-

Be it known that I, ROBERT G. HATFIELD, of the city of New York, in thecounty and State of New York, have invented a new and ImprovedSliding-Door Sheave, andI do hereby declare that the following is afull', clear, and exact description of the construction and operation ofthe same, reference being had to the annexed drawings, making a part ofthis specification, in Which- Figure 1 is a section. Fig. 2 is a plan.Fig. 3 is a side elevation. Fig. 4 is an end elevation, and Fig. 5isaperspective view4 Figs. 6, 7, S, and 9 are drawings exhibiting amodication in the application of one of the principles of the invention.

The nature of my invention is twofold viz., rst, providing a device bywhich the height and position of the door (or gate) may be readilyadjusted lin suspension-sheaves; and, secondly, coating the periphery ofthe sheave-wheels with a tire consisting of a material that`will causethem to work Without noise.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

First, in respect to the adjusting apparatus, I secure the axle A, Figs.1 and 3, to the sliding blocks B B, and form a groove, C, in which saidblocks can slide, by securing the guides D D to the suspension-bars E E.Attached to said guides at the top is the fla-nge F, and through saidiiange I insert the screws G G. These screws have abearing upon theblocks B B', and can be turned by the fingers by means of the roseheads,as shown. By raising or lowering said screws the height of the door H,Fig. 4, in relation to the wheel I and the beam J may be readilyadjusted.

To connect the suspension-bars E E with one another, I extend a narrowbar, K, over the top ofthe wheel and weld it to said suspen sion-bars. Ialso propose to make said connection by means of devices shown in Figs.6 and 7, in which the guides D D forthe blocks B B are so constructed asto prevent the separation of the bars E E, in which cases theconnecting-bar K will not be necessary.

The above is one method of applying ad- Y justing apparatus to thesheave. I now proceed to describe another, in which provision is made atthe connection of the suspension-bars with the door to effect the samepurpose. I unite the lower ends of the suspension-bars E E by means ofthe plate N, Fig. 8, and suspend the door upon said plate at the end ofthe screw O. This screw works through the nut P, and is provided with arose-head to be Worked by the fingers. By raising or lowering said screwthe door can be correspondingly elevated or depressed. The plates Q Q7Secured to the sides of the door, coniine the bars E E in the groove onthe face of said plates, and so insure their continuing in aperpendicular position.

l In Fig. 9 the same apparatus is shown in a modiedform. In place of thescrew 0, the adjustment is made by means of the eccentric R, the shaftor spindle of which is extended to the edge of the door, as shown at S,and is there pro vided with a pawl and ratchet to prevent the recoil ofthe eccentric, the latter being l turned by means of a screw-driverinserted into the groove T.

I am aware that doors and gates have been hung so as to slide by meansof suspensionsheaves, and that floor-trucks have been constructed with amuffling material applied to the periphery7 of their wheels, and I donot claim those devices as my invention.

1. The application of adjusting apparatus to the bearings ofsliding-door sheaves, for the purpose described.

2. rEhe construction of the wheels of slidin g-door sheaves with a tireor periphery composed of a mufiing or sound-deadening material.

R. G. HATFIELD.

Witnesses:

JOSEPH IRELAND, O. P. HATEIELD.

